Quantum Loophole: Some quirks of physics can be good for science

By Davide Castelvecchi, 15:56 PM April 15, 2008

Quantum theory notoriously sets limits on how precisely we can make measurements. But the quirks of the quantum realm can also be turned to advantage. Physicists have now demonstrated a way to almost double measurement precision when using photons to gauge distances.

Like markings on a ruler, the orderly waves of laser light can be used to measure lengths. In an interferometer, a laser beam is split into two beams that take two different paths. The beams bounce off mirrors and converge at the...

Source URL: https://www.sciencenews.org/article/quantum-loophole-some-quirks-physics-can-be-good-science?mode=magazine&context=606